This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A358810 #10 Feb 16 2025 08:34:04 %S A358810 5,16810,10609215,4381392020,1562500000000,522217835532030, %T A358810 168437773747672835,53095647535975155240,16463182598208445194045, %U A358810 5040439500800000000000000,1527650417538030913166754055,459160235715332056282793308860 %N A358810 Number of spanning trees in C_5 X C_n. %H A358810 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SpanningTree.html">Spanning Tree</a> %H A358810 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TorusGridGraph.html">Torus Grid Graph</a> %o A358810 (PARI) default(realprecision, 120); %o A358810 T(n, k) = round(n*k*prod(a=1, n-1, prod(b=1, k-1, 4*sin(a*Pi/n)^2+4*sin(b*Pi/k)^2))); %o A358810 a(n) = T(5, n); %Y A358810 Row 5 of A212796. %K A358810 nonn %O A358810 1,1 %A A358810 _Seiichi Manyama_, Dec 02 2022